Environmental factors have a profound effect on the microbial quality of cosmetic products. Research works have been done investigating effects of the factors singly. In this work, the microbial quality of the samples and the effect of environmental factors such as temperature and pH with change in time on the growth of Pseudomonas aeruginosa obtained by culture were examined. Our findings indicate that the effects of environmental factors such as temperature and pH on the growth of Pseudomonas aeruginosa with change in time increased with increase in temperature and time while effect of pH revealed that growth of the organism was highest at pH 7. The effect of pH varied across time and growth increased with increase in time. The combined effect of different temperatures and different pH with change in time on the growth of Pseudomonas aeruginosa showed that growth is affected when the microorganism was exposed to more than one factor. The combined effect produced a growth pattern that is different when the factors are acting independently. Environmental factors influence significantly the condition of products during in-use by consumers and storage.